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Finding the Fourth Proportional to 818.75, 1,129.88 and 450.75

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Solution

The fourth proportional to 818.75, 1,129.88 and 450.75 is: 622.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.75 : 1,129.88 = 450.75 : x
  2. Step 2: Convert to fraction form
    818.75/1,129.88 = 450.75/x
  3. Step 3: Cross multiply
    818.75x = 1,129.88 × 450.75
  4. Step 4: Simplify right side
    818.75x = 509,291.16
  5. Step 5: Solve for x
    x = 509,291.16/818.75
  6. Step 6: Final answer
    x = 622.04

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.